pgsql: Clarify documentation that primary key and unique constraints ar

Clarify documentation that primary key and unique constraints are copied
for CREATE TABLE LIKE ... INCLUDING INDEXES.

Per report from david.sahagian@emc.com

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/de87d4704432e98a327dbf42dbc4711fa2628a9c

Modified Files
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doc/src/sgml/ref/create_table.sgml | 17 +++++++----------
1 files changed, 7 insertions(+), 10 deletions(-)